Successfully complete the indicated task to unlock the corresponding ending:

Humiliating Loss: Lose to Red Magnus in Episode 1-5.

Usalia's Death Ending: Allow Usalia to die in Episode 4-5.

Leveling up quickly

Use an item eight times on yourself. You will level up, no matter what you current level. Increase your EXP gauge through the cheat shop to use fewer items. For example, 420% will result in a level up with just two items. Try using Unopened Sodas.